帮帮忙，两道逻辑！！！！！！！！！！！！

这两题我选的分别是：19。B  20.A能不能帮我讲讲为啥答案是E.B。咋想都想不通

19.   It is widely assumed that a museum is helped financially when a generous patron donates a potential exhibit. In truth, however, donated objects require storage space, which is not free, and routine conservation, which is rather expensive. Therefore, such gifts exacerbate rather than lighten the demands made on a museum’s financial resources.

Which of the following, if true, most seriously weakens the argument above?

(A) To keep patrons well disposed, a museum will find it advisable to put at least some donated objects on exhibit rather than merely in storage.

(B) The people who are most likely to donate valuable objects to a museum are also the people who are most likely to make cash gifts to it.

(C) A museum cannot save money by resorting to cheap storage under less than adequate conditions, because so doing would drive up the cost of conservation.

(D) Patrons expect a museum to keep donated objects in its possession rather than to raise cash by selling them.（E）

(E) Objects donated by a patron to a museum are often of such importance that the museum would be obliged to add them to its collection through purchase if necessary.

20.   Despite the approach of winter, oil prices to industrial customers are exceptionally low this year and likely to remain so. Therefore, unless the winter is especially severe, the price of natural gas to industrial customers is also likely to remain low.

Which of the following, if true, provides the most support for the conclusion above?

(A) Long-term weather forecasts predict a mild winter.

(B) The industrial users who consume most natural gas can quickly and cheaply switch to using oil instead.

(C) The largest sources of supply for both oil and natural gas are in subtropical regions unlikely to be affected by winter weather.

(D) The fuel requirements of industrial users of natural gas are not seriously affected by the weather.（B）

(E) Oil distribution is more likely to be affected by severe winter weather than is the distribution of natural gas.

The 1st one < I suppose B is correct which can better explain why gifts exacerbate rather than lighten the demands financially .

The 2nd one < I should choose D .To unswer this logic sentence, we just need find the coorelative linkage between oil and gas .

the coorelation between  the oil and gas  is explained as  "unless the winter is especially severe, the price of natural gas to industrial customers is also likely to remain low" . This hints that the reason why industry customers swift from using oil to gas is closely affacted by the weather.

19题

结论是捐赠导致博物馆财政负担，因为要花钱去保护，展览，等等

E讲的是这些捐赠的东西对博物馆是很重要的，因此博物馆经常是要花大价钱去买，相比保存很展览的费用，那时贵多了，所以如果有人免费捐那当然是省钱

20题

题目推理的逻辑是对工业企业来讲oil便宜，所以gas也会很便宜

那要得出这个结论就要知道这两个是什么关系，应该和天气无关

20题

A：oil prices to industrial customers are exceptionally low this year and likely to remain so，

B：the price of natural gas to industrial customers is also likely to remain low

  A-->B 

前边所有的都在讲OIL，最后却来了句GAS，所以本体的关键就是要建立起三者的关系：GAS、OIL、Industrial customers，所以B对，A必错。剩下的也可以无关词排除CD，至于E，他是说GAS跟OIL的反向关系，而原文是说正向关系（价格都低）。这样是最简单的，不用想具体为什么B对